Brain stem projections to the pulvinar-lateralis posterior complex of the cat |
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Authors: | Dr R Spreafico C Kirk S Franceschetti G Avanzini |
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Institution: | (1) Dept. of Anatomy, School of Medicine U.N.C., Chapel Hill, NC, USA;(2) Dept. of Neurophysiology, Istituto Neurologico C. Besta , Milan, Italy;(3) Present address: Dept. of Neurophysiology, Istituto Neurologico C. Besta , Milan, Italy |
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Abstract: | Summary The present experiments were undertaken to define the areas of projection of pretectum and superior colliculus to the pulvinar and n. lateralis posterior, respectively, and to define other brain stem structures projecting to these thalamic nuclei in cats. For this purpose the technique of retrograde transport of horseradish peroxidase (HRP) has been used.After injection of the enzyme in the pulvinar, neurons were labeled in all subdivisions of the pretectal area. The majority of the labeled cells were located in the n. pretectalis posterior and n. tractus opticus although cells filled with HRP were present also in the n. pretectalis anterior pars compacta and area pretectalis medialis. Neurons projecting to the pulvinar were also found in the periaqueductal gray, reticular formation and locus coeruleus.When HRP was injected in the n. lateralis posterior, labeled neurons were present in the II and III subdivisions of the second layer of the superior colliculus. The location of these cells shifted from medial to lateral as the injections were shifted from posterior to anterior within the lateralis posterior. Neurons projecting to this nucleus were also present in the intermediate layers of the superior colliculus, lateral hypothalamus and parabigeminal nucleus.The possible role of the pretectal area and superior colliculus in mediating somesthetic input to the pulvinar and lateralis posterior, respectively, and the role of these structures in the control of ocular movements, are discussed.Abbreviations APM
area pretectalis medialis
- Cu
nucleus cuneiformis
- CS
nucleus centralis superior
- fr
fasciculus retroflexus
- Gp
pontine gray
- Hb
nucleus habenulae
- IC
inferior colliculus
- LC
locus coeruleus
- LGB
lateral geniculate body
- LP
lateralis posterior
- MGB
medial geniculate body
- nPAc
nucleus pretectalis anterior pars compacta
- nPAr
nucleus pretectalis anterior pars reticularis
- nPC
nucleus posterior commissurae
- nPP
nucleus pretectalis posterior
- nTO
nucleus tractus opticus
- PAG
periaqueductal gray
- PB
nucleus parabigeminalis
- Pi
pulvinar inferior
- PO
nucleus posterior of the thalamus
- Pul
pulvinar
- Pt
pretectum
- RF
reticular formation
- Rtp
tegmental reticular nucleus
- SC
superior colliculus
Supported by H. de Jur Foundation and USPHS Grant TWO 2718Present address: Max-Planck-Institut für biophysikalische Chemie, Postfach 968, D-3400 Göttingen, Federal Republic of Germany |
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Keywords: | Thalamus Visual system HRP Cat |
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